Yanjun Guo, Luqian 璐茜 Wang 王, C. Liu 刘, Y. Wu 吴, Z. Han 韩, X. Chen 陈
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引用次数: 0
摘要
失控恒星是从其诞生地以巨大的奇特速度喷射出来的 OB 型恒星。关于它们形成的主要假说包括超新星抛射机制和动态抛射设想。识别失控群是研究它们的形成和演化的第一步。在此,我们介绍了从大天区多目标光纤光谱望远镜(LAMOST)中分辨率巡天数据第8版(DR8)数据库中搜索银河失控候选星的工作。在利用 LAMOST DR8 的径向速度测量数据和 Gaia Data Release 3 的天体测量解法研究了 4432 颗早期型恒星(主要是 B 型恒星)的运动特性之后,我们确定了 229 颗失控候选恒星。它们的投影旋转速度分布很广。我们对失控恒星群的银河空间分布进行了研究,发现它们中的大多数可能都位于银河系薄盘内。根据对候选恒星多普勒频移的分析,我们发现有两颗双失控候选恒星显示出速度变化,估计轨道周期分别为 40 天和 61 天。
A Catalog of Early-type Runaway Stars from LAMOST DR8
Runaway stars are OB-type stars ejected from their birthplace with large peculiar velocities. The leading hypothesis addressed in their formation includes the supernova ejection mechanism and the dynamic ejection scenario. Identification of runaway populations is the first step to investigating their formation and evolution. Here we present our work of searching for Galactic runaway candidate stars from the Large sky Area Multi-Object fiber Spectroscopic Telescope (LAMOST) Medium Resolution Survey Data Release 8 (DR8) database. After studying the kinematic properties for a collection of 4432 early-type stars, predominantly B-type stars, using radial velocity measurements from LAMOST DR8 and astrometric solutions made by Gaia Data Release 3, we identified 229 runaway candidate stars. They span a wide distribution in projected rotational velocities. We investigated the Galactic spatial distribution of the runaway population and noticed that most of them likely reside within the Galactic thin disk. Based upon analyzing the Doppler shifts of the candidate stars, we found two binary runaway candidates displaying velocity variations with estimated orbital periods of 40 and 61 days.